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数组比较
方法 1：

JSON.stringify(a1) == JSON.stringify(a2)
//或者
a1.toString() == a2.toString()




不建议使用,"> 
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            <blockquote>
<h5 id="数组比较"><a href="#数组比较" class="headerlink" title="数组比较"></a>数组比较</h5></blockquote>
<p>方法 1：</p>
<pre><code class="javascript">
JSON.stringify(a1) == JSON.stringify(a2)
//或者
a1.toString() == a2.toString()

</code></pre>
<a id="more"></a>

<h4 id="不建议使用此方法"><a href="#不建议使用此方法" class="headerlink" title="不建议使用此方法"></a>不建议使用此方法</h4><h6 id="这种方法在某些情况下是可行的，当两个数组的元素顺序相同且元素都可以转换成字符串的情况下确实可行，但是这样的代码存有隐患，比如数字被转换成字符串，数字“1”和字符串“1”会被认为相等，可能造成调试困难，不推荐使用。"><a href="#这种方法在某些情况下是可行的，当两个数组的元素顺序相同且元素都可以转换成字符串的情况下确实可行，但是这样的代码存有隐患，比如数字被转换成字符串，数字“1”和字符串“1”会被认为相等，可能造成调试困难，不推荐使用。" class="headerlink" title="这种方法在某些情况下是可行的，当两个数组的元素顺序相同且元素都可以转换成字符串的情况下确实可行，但是这样的代码存有隐患，比如数字被转换成字符串，数字“1”和字符串“1”会被认为相等，可能造成调试困难，不推荐使用。"></a><span style="color:red">这种方法在某些情况下是可行的，当两个数组的元素顺序相同且元素都可以转换成字符串的情况下确实可行，但是这样的代码存有隐患，比如数字被转换成字符串，数字“1”和字符串“1”会被认为相等，可能造成调试困难，不推荐使用。</span></h6><p>方法2 ：</p>
<pre><code class="javascript">
 // Warn if overriding existing method
if(Array.prototype.equals)
console.warn(&quot;Overriding existing Array.prototype.equals. Possible causes: New API defines the method, there&#39;s a framework conflict or you&#39;ve got double inclusions in your code.&quot;);
 // attach the .equals method to Array&#39;s prototype to call it on any array
 Array.prototype.equals = function (array) {
// if the other array is a falsy value, return
if (!array)
         return false;

     // compare lengths - can save a lot of time
     if (this.length != array.length)
         return false;

     for (var i = 0, l = this.length; i &lt; l; i++) {
        // Check if we have nested arrays
         if (this[i] instanceof Array &amp;&amp; array[i] instanceof Array) {
           // recurse into the nested arrays
             if (!this[i].equals(array[i]))
                 return false;       
         }           
         else if (this[i] != array[i]) {
            // Warning - two different object instances will never be equal: {x:20} != {x:20}
            return false;   
        }           
     }       
     return true;
 }
 // Hide method from for-in loops
 Object.defineProperty(Array.prototype, &quot;equals&quot;, {enumerable: false});

var a = [1,2,3] ;
var b = [1,2,4] ;


a.equals(b)</code></pre>
<blockquote>
<h5 id="对象的比较"><a href="#对象的比较" class="headerlink" title="对象的比较"></a>对象的比较</h5></blockquote>
<pre><code class="javascript">Object.prototype.equals = function(object2) {
    //For the first loop, we only check for types
    for (propName in this) {
        //Check for inherited methods and properties - like .equals itself
        //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty
        //Return false if the return value is different
        if (this.hasOwnProperty(propName) != object2.hasOwnProperty(propName)) {
            return false;
        }
        //Check instance type
        else if (typeof this[propName] != typeof object2[propName]) {
            //Different types =&gt; not equal
            return false;
        }
    }
    //Now a deeper check using other objects property names
    for(propName in object2) {
        //We must check instances anyway, there may be a property that only exists in object2
            //I wonder, if remembering the checked values from the first loop would be faster or not
        if (this.hasOwnProperty(propName) != object2.hasOwnProperty(propName)) {
            return false;
        }
        else if (typeof this[propName] != typeof object2[propName]) {
            return false;
        }
        //If the property is inherited, do not check any more (it must be equa if both objects inherit it)
        if(!this.hasOwnProperty(propName))
          continue;

        //Now the detail check and recursion

        //This returns the script back to the array comparing
        /**REQUIRES Array.equals**/
        if (this[propName] instanceof Array &amp;&amp; object2[propName] instanceof Array) {
                   // recurse into the nested arrays
           if (!this[propName].equals(object2[propName]))
                        return false;
        }
        else if (this[propName] instanceof Object &amp;&amp; object2[propName] instanceof Object) {
                   // recurse into another objects
                   //console.log(&quot;Recursing to compare &quot;, this[propName],&quot;with&quot;,object2[propName], &quot; both named \&quot;&quot;+propName+&quot;\&quot;&quot;);
           if (!this[propName].equals(object2[propName]))
                        return false;
        }
        //Normal value comparison for strings and numbers
        else if(this[propName] != object2[propName]) {
           return false;
        }
    }
    //If everything passed, let&#39;s say YES
    return true;
}

var a = {a:1,b:2} ;
var b = {a:1,b:2} ;
b.equals(a)



</code></pre>

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